Philip Pullman found fame in the 1990s with the His Dark Materials fantasy trilogy. Now, the children who grew up with the heroine, Lyra, can revisit her as an adult in The Secret Commonwealth. The author talks about having his work adapted for the small screen, the dangers of single vision and the allure of dust. “We know we’re conscious, but philosophers are still struggling with what David Chalmers calls ‘the hard problem’ – how do we get from matter to consciousness? Once you accept that consciousness is a normal property of matter, and that everything is, in however dim and rudimentary way, conscious, everything becomes clearer. This is the question towards which The Book of Dust is working.”